In a recent experiment, anti-bacterial hand sanitizer was compared to two different anti-bacterial soaps. Students washed their hands using the products and warm
water for two minutes, and then dried their hands with a paper towel. The standard
of comparison was rubbing hands vigorously for 2 minutes in warm water, without
any soap or sanitizer, and then drying with a paper towel. The sanitizer
advertisement claimed to kill bacteria more effectively than any anti-bacterial soap.
After washing, hands were swabbed and then the swab applied to a culture plate and
incubated. Finally, the bacterial cultures were counted.
Based on the procedures and data, which of these is the MOST appropriate
conclusion?
The advertiser's claims are true; the hand sanitizer worked best.
The control situation was as effective as the hand sanitizer and anti-bacterial
soaps.
The experiment is not valid; there is no control.
Roth sans did a better igb killing bacteria than the hand sanitizer.